TV-Series
Description
Oyuki is the snow queen of the planet Neptune, a frozen world in Urusei Yatsura that is populated almost entirely by women because most of its men must leave the planet to find work. She first appears when she opens a portal connected to Ataru Moroboshi's closet in order to dispose of the excess snow piling up on her home world. The character is modeled on the yuki-onna, the snow woman of Japanese folklore, and that influence is visible in her appearance, manner, and abilities. She is typically shown with very long purple hair, red eyes, and a long, elegant kimono.

In terms of personality, Oyuki is soft-spoken, placid, graceful, and regal. She is extremely slow to anger and generally polite even in difficult situations. Beneath that calm exterior, however, she has a frighteningly cold and practical side. She is a frugal ruler who always carries an account book to manage her finances and devises ways to market products made on Neptune, such as sherbet-bird hybrids and windchimes that cool houses during the summer. When she does become angry, she rarely shows it through her expression; instead, her face turns serious and the temperature around her drops dramatically while snow and ice react wildly to her mood.

Her motivations center on her duties as queen of Neptune and her loyalty to her friends. She manages her planet's affairs carefully and appears whenever Lum needs assistance, often arriving through the classroom closet or another existing space-time warp, which she can use to travel between planets. Her role in the story is that of a recurring supporting character and one of Lum's childhood friends.

Her key relationships are with Lum, Ran, and Benten, with whom she attended grade school as a child. She is especially close to Lum and supports her when called upon. Despite her gentle nature, she is the only person in the galaxy that Ran genuinely fears, because of the wrath Oyuki can unleash when truly provoked. Her encounters with Ataru are usually comedic and marked by formal politeness, though she can turn cold if she feels disrespected.

In terms of abilities, Oyuki can create and control ice, snow, and extreme cold, and when she actually fights she proves to be one of the most powerful characters in the series. She can also make use of existing space-time warps and portals for travel. Her development is subtle: she remains largely serene and consistent, but her reputation for hidden power and her role as the calm, responsible member of her friend group deepen over time, and her rare outbursts of anger become a recurring and defining part of her character.